Hello all,

Long before I inherited my 99 Bonneville from my uncle, it had some, unidentifiable substance "Growing" on the middle rear seat belt. Neither he nor I know what it is or where it came from. ITs white and kind of salt like in texture, but thats besides the point. IT seemed to have happened as the belt was pushed below the rear seat- and the actual metal part of the belt is rusted. Does anyone know where it came from, what it is, and how to get rid of it?
I spend hours cleaning that car all the time, and thats the only thing (besides an oily engine bay) thats keeping it from being spotless.

sounds like corrosion from moisture.. So it looks like corrosion on aluminum? thats what i sounds like.

If the belt itself was rusted, and everything was stuck under the seat, that would lead me to believe that water is getting under the back seat. If you live in an area where the roads get salted especially, or where a lot of lime, calcium, etc washes on to the roads during rain, you may wish to check your rear wheel wells for rust. I also recommend that you pull the back seat out to see what is under there. I think your problems are bigger than a dirty seat belt at this point.

Yes there is some rust in the well, and how do I go about pulling out the seat? I live in Northern NJ, so there is a bit of salt.

Usually you get your hand in the space between the seat back and bottom, pull the bottom out from under then back, then the front should pop off. At least that is how mine came off.

Ok a friend and I pulled it off, and along the back edge where the belt is located there is a rust colored stain. And according to my friend, a smell.

well if u can get to the backside of that area i would spray it with bedliner in a can or rust preventing paint. But i prefer bedliner, same goes for your inner wheelwell.. clean the area well behind your seat and coat it with what ever u prefer to prevent the cancer from getting worse